DE4343117A1 - Bone fixation system for Osteosynthesis - Google Patents
Bone fixation system for OsteosynthesisInfo
- Publication number
- DE4343117A1 DE4343117A1 DE19934343117 DE4343117A DE4343117A1 DE 4343117 A1 DE4343117 A1 DE 4343117A1 DE 19934343117 DE19934343117 DE 19934343117 DE 4343117 A DE4343117 A DE 4343117A DE 4343117 A1 DE4343117 A1 DE 4343117A1
- Authority
- DE
- Germany
- Prior art keywords
- thread
- bone
- screw
- seat
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
- A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
Abstract
Description
Die Erfindung betrifft ein Fixationssystem für Knochen mit einer Knochenplatte und mindestens einer Knochenschraube nach dem Oberbegriff des Anspruches 1.The invention relates to a fixation system for bones a bone plate and at least one bone screw according to the preamble of claim 1.
Derartige Fixationssysteme werden in der Osteosynthese verwendet, wobei die Knochenschrauben mit den Fragmenten verbunden werden und die Knochenplatten die Fraktur über brücken. Hierbei ist wünschenswert, die Knochenschraube in Anpassung an die Gegebenheiten des zu verbindenden Knochenteiles unter verschiedenen Winkeln in die Knochen platte einzubringen. Hierzu haben bei einem bekannten Fixationssystem die Knochenschrauben Köpfe mit etwa halb kugelförmiger Sitzfläche, denen eine Sitzfläche in Durch gangslöchern der Knochenplatte zugeordnet ist. Wenn bei spielsweise bei einer einfachen Unterschenkelfraktur die beiden Knochenstücke miteinander verbunden werden müssen, wird die metallische Knochenplatte auf die eingerichteten Knochenstücke gelegt. Danach werden die Schrauben in den Knochen so eingedreht, daß die Auflageflächen der Schrau benköpfe und der Plattenlöcher in Anlage aneinander kommen und die Platte gegen den Knochen gepreßt wird. Es resul tiert eine feste Verbindung von Knochenteilen, Knochen platte und Knochenschrauben.Such fixation systems are used in osteosynthesis used, the bone screws with the fragments be connected and the bone plates over the fracture bridges. It is desirable to screw the bone in Adaptation to the circumstances of the to be connected Bone part into the bones at different angles insert plate. To do this with a known Fixation system with about half the bone screw heads spherical seat, which a seat in through passage holes is assigned to the bone plate. If at for example, with a simple lower leg fracture two pieces of bone have to be connected to each other, the metallic bone plate is placed on the Pieces of bone placed. Then the screws in the Bone screwed in so that the contact surfaces of the screw Heads and the plate holes come into contact with each other and the plate is pressed against the bone. It resul creates a firm connection between bone parts and bones plate and bone screws.
Es hat sich gezeigt, daß eine Lockerung der Knochenschrau ben-Knochenplatten-Verbindung stattfinden kann. Eine der Ursachen liegt in der ungenügenden Stabilität der Winkel verbindung von Knochenschraube und Knochenplatte, die nur durch die Reibkräfte zwischen Schraubenkopf und Platten loch gesichert ist. Eine winkelstabile Verbindung von Kno chenschraube und Knochenplatte führt hingegen zu einem Stabilitätsgewinn der Gesamtmontage. Es sind verschiedene Lösungen bekannt, eine derartige stabile Verbindung zu er reichen.It has been shown that loosening of the bone screw ben bone plate connection can take place. One of the The reason lies in the insufficient stability of the angles connection of bone screw and bone plate, the only due to the frictional forces between the screw head and the plates hole is secured. An angle-stable connection from Kno However, the screw and bone plate lead to one Gain stability of the entire assembly. They are different Known solutions to such a stable connection to it pass.
Gemäß EP-A-10 201 024 kann dies beispielsweise dadurch ge schehen, daß der Knochenplatte eine Druckplatte zugeordnet ist, die mit den Schraubenköpfen verspannbar ist und diese in einer gewählten Winkellage fixiert. Die aufwendigen Fixationssysteme mit einer Druckplatte sind aufgrund ihres verhältnismäßig großen Volumens in der Anwendbarkeit ein geschränkt.According to EP-A-10 201 024, this can be done, for example see that a pressure plate is assigned to the bone plate is that can be clamped with the screw heads and this fixed in a selected angular position. The elaborate Fixation systems with a pressure plate are due to their relatively large volume in applicability limited.
Eine andere Lösung besteht gemäß WO/89 041 50 darin, den Schraubenkopf in einen Schlitzbereich mit einer Spreiz schraube aufzuweiten und hierdurch im Plattenloch einzu pressen. Dabei haben der Schraubenkopf bzw. ein diesen um gebender Einsatz sowie das Plattenloch kugelförmige Sitz flächen, die eine Ausrichtung unter verschiedenen Winkeln ermöglichen. Dieses Fixationssystem ist ebenfalls in Her stellung und Anwendung aufwendig.Another solution according to WO / 89 041 50 is that Screw head into a slot area with a spread expand the screw and thereby insert it into the plate hole press. The screw head or one around it giving insert as well as the plate hole spherical seat surfaces that have an alignment at different angles enable. This fixation system is also in Her position and application complex.
Schließlich ist schon bekannt, den Schraubenkopf mit einem Außengewinde und das Plattenloch mit einem Innengewinde zu versehen. Wird nun die Schraube in den Knochen einge dreht, so kommt es durch die Gewindeverbindung zu einer winkelstabilen Ausrichtung von Platte und Schraube. Diese Lösung hat jedoch den gravierenden Nachteil, daß die Schraube nicht in einem beliebigen Winkel, sondern nur in der durch die Gewindeachsen vorgegebenen Ausrichtungen in das Plattenloch eingebracht werden kann.After all, it is already known to use a screw head External thread and the plate hole with an internal thread to provide. Now the screw is inserted into the bone turns, the threaded connection leads to a angular stable alignment of plate and screw. These Solution has the serious disadvantage that the Do not screw at any angle, only in of the orientations given by the thread axes in the plate hole can be made.
Der Erfindung liegt die Aufgabe zugrunde, ein Fixations system der eingangs genannten Art mit wählbarem und fixier barem Winkel zwischen Knochenplatte und Knochenschraube zu schaffen, welches einen geringeren Platzbedarf hat und we niger aufwendig ist.The invention has for its object a fixations system of the type mentioned with selectable and fix between the bone plate and the bone screw create, which takes up less space and we is less expensive.
Die Aufgabe wird durch ein Fixationssystem gemäß Anspruch 1 gelöst. Vorteilhafte Ausgestaltungen des Systems sind in den Unteransprüchen angegeben.The task is accomplished by a fixation system according to claim 1 solved. Advantageous configurations of the system are shown in specified in the subclaims.
Bei einem erfindungsgemäßen Fixationssystem sind die Sitz flächen von Knochenplatte und Knochenschraube so gestal tet, daß sie eine gegenseitige Ausrichtung unter verschie denen Winkellagen zulassen. Hierzu kann die Knochenschrau be ein sphärische Sitzfläche an einem Schraubenkopf und die Knochenplatte eine zylindrische, konische oder sphä rische Sitzfläche in einem Durchgangsloch haben. Ferner sind die Sitzflächen mit den Mitteln zum Festlegen einer bestimmten Winkelausrichtung von Knochenschraube und Knochenplatte versehen, die ein vorgeformtes Gewinde an mindestens einer der Sitzflächen aufweisen. Beim Eindrehen der Knochenschraube in den Knochen unter einem bestimmten Winkel bildet das mindestens eine Gewinde eine Gewindever bindung der Sitzflächen, welche die Schraube unter ihrem Einschraubwinkel an der Platte sichert. Die Gewindeverbin dung kann unter Umformung des Materiales entstehen und durch Kraftschluß (Reibschluß) und/oder Stoffschluß (Reib schweißen) zwischen den Sitzflächen gesichert sein. Dabei kann sich die Materialumformung durch Anpassung des vorge formten Gewindes einer Sitzfläche an seine durch den Schraubwinkel bestimmte Kontaktflächen der anderen Sitz fläche und umgekehrt ergeben. Die reibschlüssige bzw. stoffschlüssige Verbindung kann eine Folge der Materialum formung sein. Statt einer Platte kommen auch andere chi rurgische/orthopädische Verbindungsträger unterschiedli cher Gestaltung in Betracht.In a fixation system according to the invention, the seats are surfaces of the bone plate and bone screw that it shifts mutual alignment among which allow angular positions. The bone screw can do this be a spherical seat on a screw head and the bone plate is cylindrical, conical or spherical have a seat in a through hole. Further are the seats with the means to set one certain angular orientation of bone screw and Bone plate provided with a preformed thread have at least one of the seat surfaces. When screwing in the bone screw in the bone under a certain Angle, the at least one thread forms a thread binding of the seats, which the screw under their Screw-in bracket on the plate secures. The thread connection dung can arise while reshaping the material and by friction (friction) and / or material (friction welding) must be secured between the seats. Here can the material forming by adjusting the pre shaped thread of a seat to its by the Angle of contact certain contact surfaces of the other seat surface and vice versa. The frictional or Cohesive connection can be a consequence of the material be formation. Other chi come instead of a plate rurgical / orthopedic connection carriers differ design.
Die Steigung des vorgeformten Gewindes kann geringfügig kleiner als die Steigung des Knochengewindes der Schraube sein, um einen Anpreßdruck der Platte gegen die Knochen fläche zu erreichen.The pitch of the preformed thread can be slight less than the pitch of the screw's bone thread be a pressure of the plate against the bone reach area.
Bei einer bevorzugten Ausgestaltung hat das vorgeformte Gewinde voneinander beabstandete Gewindesegmente, deren Abstandsbereiche das Eindringen eines Gegengewindes unter verschiedenen Einschraubwinkeln begünstigen. Die Gewinde segmente können jeweils einen Einlaufbereich mit einem zum Einlaufende hin konvergierenden Gewindeprofil haben. Ähn lich wie eine Schlittenkufe erleichtern diese solchermaßen gestalteten Segmente das Aufnehmen bzw. Einfädeln eines Gegengewindes. Die Anzahl der Gewindesegmente pro Gewinde gang kann verschieden gewählt sein und bei einem Gewinde variieren. Vorzugsweise hat jeder Gewindegang des vorge formten Gewindes 2-4 Gewindesegmente. Insbesondere aus fertigungstechnischen Gründen können die Gewindesegmente in bestimmten Umfangsbereichen des vorgeformten Gewindes gruppiert angeordnet sein.In a preferred embodiment, the preformed one Threads spaced apart thread segments whose Distance areas the penetration of a counter thread under favor different screw-in angles. The threads segments can each have an inlet area with a Have incoming thread profile converging. Similar Like a sled runner, this makes it easier designed segments to pick up or thread a Counter thread. The number of thread segments per thread gear can be selected differently and with a thread vary. Each thread preferably has the pre formed thread 2-4 thread segments. Especially from The thread segments can be used for manufacturing reasons in certain circumferential areas of the preformed thread be arranged in groups.
Sowohl die Sitzfläche der Knochenplatte als auch die Sitz fläche der Knochenschraube können ein vorgeformtes Gewinde aus voneinander beabstandeten Gewindesegmenten haben. Durch das Eindringen der Knochenschraube in die Knochen platte kann es dann zu einer Verhakung der Segmente ver schiedener Gewinde kommen, die ein sekundäres Lockern und Herausdrehen erschwert.Both the seat of the bone plate and the seat surface of the bone screw can be a pre-formed thread from spaced apart thread segments. By penetrating the bone screw into the bones plate can then get caught in the segments different threads come, which is a secondary loosening and Unscrewing difficult.
Statt dessen kann aber auch eine Sitzfläche ein vorgeform tes Gewinde mit Gewindesegmenten und die andere Sitzfläche ein vorgeformtes durchgehendes Gewinde aufweisen, was ins besondere fertigungstechnische Vorteile bietet. Dabei kön nen die Gewindesegmente an der Schraube oder der Platte und kann das durchgehende Gewinde an der Platte oder der Schraube angeordnet sein.Instead, a seat can be preformed thread with thread segments and the other seat have a preformed continuous thread, which ins offers special manufacturing advantages. You can the thread segments on the screw or plate and can the continuous thread on the plate or the Screw be arranged.
Ein vorgeformtes Gewinde kann aber auch nur in einer der Sitzflächen vorhanden sein, die aus einem härteren Mate rial als die andere Sitzfläche ist. Durch das Eindrehen der Schraube kommt es dann zu einer Gewindeausbildung in der Plattensitzfläche durch Umformungsvorgänge und zu ei nem durch Reibschluß bzw. Stoffschluß gesicherten Gewinde sitz. Das vorgeformte Gewinde ist bevorzugt an der Schrau be ausgebildet und kann ein durchgehendes Gewinde sein. Der Einschraubvorgang wird dadurch erleichtert, daß geeig nete Materialien für Platte und Schraube verwendet werden. Bei veredelten Stählen kann die gewindetragende Sitzfläche einer Schraube gehärtet sein. Eine weitere Lösung besteht darin, daß bei Titan die Sitzfläche der Schraube aus einer harten Titan-Legierung besteht und die Platte aus weiche rem Rein-Titan gefertigt ist und das Gewinde an der Schraube muß dabei so vorgeformt werden, daß der Schnei de-/Umformvorgang erleichtert wird.A preformed thread can only be in one of the Seating may be made from a harder mate rial than the other seat. By screwing in the screw then forms a thread in the seat surface by forming processes and egg thread secured by friction or material connection Seat. The preformed thread is preferred on the screw be trained and can be a continuous thread. The screwing-in process is facilitated in that it is suitable Nete materials for plate and screw are used. With refined steels, the thread-bearing seat can be hardened by a screw. Another solution is there in that the titanium seat of the screw from a hard titanium alloy and the plate is made of soft rem is made of pure titanium and the thread on the Screw must be preformed so that the cutting deformation / forming process is facilitated.
Durch Einsatz eines mehrgängigen Gewindes läßt sich insbe sondere bei vorgeformten Gewinden mit Gewindesegmenten eine größere Variabilität der Winkelausrichtung erreichen.In particular, by using a multi-start thread especially for preformed threads with thread segments achieve greater variability in angular orientation.
Bevorzugt ist die Sitzfläche der Knochenschraube an der Mantelfläche eines Schraubenkopfes ausgebildet. Um ein Durchtreten des Schraubenkopfes durch Knochenplatte weiter zu behindern kann dieser einen Anschlag für Anlage an ei nen Gegenanschlag der Knochenplatte haben. Die Knochen platte hat hingegen ihre Sitzfläche bevorzugt in einem Durchgangsloch ausgebildet.The seating surface of the bone screw is preferred on the Shell surface of a screw head is formed. To a Pass the screw head through the bone plate further this can hinder a stop for contact with egg have a counter stop of the bone plate. The bones plate, however, preferably has its seat in one Through hole formed.
Die Erfindung hat gegenüber den bekannten Lösungen einer winkelstabilen Verbindung an einem Fixationssystem für Knochen vor allem die folgenden Vorteile:The invention has one over the known solutions Angle stable connection on a fixation system for Bones mainly have the following advantages:
- - Das System besteht aus nur zwei Komponenten, nämlich der Knochenplatte und der Knochenschrauben.- The system consists of only two components, namely the Bone plate and the bone screws.
- - Weitere Bauteile, die beispielsweise auftragen oder die Montage kompliziert gestalten, werden vermieden.- Other components that apply, for example, or that Complicate assembly is avoided.
- - Die Sicherung der Schraube unter einem bestimmten Winkel an der Platte ist von großer Festigkeit. Die Gefahr des Lösens an kugelförmigen Sitzflächen wird vermieden.- Securing the screw at a certain angle on the plate is of great strength. The danger of Loosening on spherical seats is avoided.
- - Die Operationstechnik wird durch die erfindungsgemäße Lö sung verändert, weil das Festlegen des Winkels zwischen Schraube und Platte zugleich mit dem Eindrehen in den Knochen erfolgt. Das Anziehen von Zusatzteilen bekannter winkelstabiler Verbindungen entfällt. Der Einsatz von Drehmomentenschraubenziehern ist in Betracht zu ziehen, um ein Zerstören der Gewinde der Verbindung durch Über drehen zu vermeiden. Drehmomentenschraubenzieher werden auch schon bei den bekannten Implantatsystemen verwendet.- The surgical technique is by the Lö inventive solution changed because the setting of the angle between Screw and plate at the same time as screwing into the Bone is done. The tightening of additional parts known angle-stable connections are eliminated. The use of Torque screwdrivers should be considered to destroy the thread of the connection through over to avoid turning. Become a torque screwdriver already used in the known implant systems.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der anliegenden Zeichnungen bevorzugter Ausführungsformen. In den Zeich nungen zeigen:Further details and advantages of the invention emerge from the following description of the attached Drawings of preferred embodiments. In the drawing shows:
Fig. 1 Knochenschraube vor Verbindung mit verschiedenen Knochenplatten a-c im Teilschnitt; Fig. 1 bone screw before connection to various bone plates ac in partial section;
Fig. 2 Knochenschraube mit Anschlag im Teilschnitt; Fig. 2 bone screw with stop in partial section;
Fig. 3 Knochenschraube mit durchgehendem mehrgängigem Ge winde im Teilschnitt; Fig. 3 bone screw with continuous multi-start Ge thread in partial section;
Fig. 4 Knochenschraube mit zweigängigem unterbrochenem Ge winde im Teilschnitt; Fig. 4 bone screw with two-start broken Ge thread in partial section;
Fig. 5 Knochenschraube mit gehärtetem Formgewinde im Teil schnitt; Fig. 5 cut bone screw with hardened form thread in part;
Fig. 6 Teil einer Knochenplatte mit durchgehendem Innenge winde in der Draufsicht; Fig. 6 part of a bone plate with continuous Innenge thread in plan view;
Fig. 7 Teil einer Knochenplatte mit 4fachem unterbroche nem Innengewinde in der Draufsicht; Fig. 7 part of a bone plate with 4-fold interrupted internal thread in plan view;
Fig. 8 Teil einer Knochenplatte mit 3fachem unterbroche nem Innengewinde in der Draufsicht. Fig. 8 part of a bone plate with a triple interruption internal thread in plan view.
Bei einem Fixationssystem gemäß Fig. 1 trägt eine Knochen schraube 1 an einem Schaft 2 einen Schraubenkopf 3, der an der Unterseite eine im wesentlichen sphärische Sitzfläche 4 und an der Oberseite eine Abflachung 5 hat. In der Sitz fläche 4 ist ein Außengewinde 6 vorgeformt. Das Außenge winde 6 hat eine Steigung, die geringfügig kleiner als die Steigung eines Knochengewindes am abgebrochenen Teil des Schaftes 2 ist. In der Abflachung 5 ist eine Aufnahme 7 für ein formschlüssiges Gegenteil eines Eindrehwerkzeuges ausgebildet.In a fixation system as shown in FIG. 1 is a bone screw 1 bears on a shaft 2, a screw head 3, which has at the bottom a substantially spherical seat surface 4 and at the top of a flattening. 5 In the seat surface 4 , an external thread 6 is preformed. The Außenge thread 6 has a slope that is slightly smaller than the slope of a bone thread at the broken part of the shaft 2 . In the flattening 5 a seat 7 is formed of a Eindrehwerkzeuges for a form-fitting opposite.
Dieser Knochenschraube 1 können verschiedene Knochenplat ten 8 zugeordnet werden, die in den Teilen a-c der Fig. 1 dargestellt sind. Den Knochenplatten 8 ist gemeinsam, daß sie ein Durchgangsloch 9 zum Durchführen des Schaftes 2 und zur Aufnahme des Kopfes 3 der Schraube 1 haben. Sämt liche Durchgangslöcher sind mit einem Innengewinde 10 ver sehen. Die Innengewinde 10 sind an Sitzflächen 11 ausge bildet, die gemäß Teildarstellung a zylindrisch, gemäß Teildarstellung b konisch und gemäß Teildarstellung c sphärisch sind.This bone screw 1 can be assigned to various bone plates 8 , which are shown in the parts ac of FIG. 1. The bone plates 8 have in common that they have a through hole 9 for the passage of the shaft 2 and for receiving the head 3 of the screw 1 . All liche through holes are seen with an internal thread 10 ver. The internal threads 10 are formed on seat surfaces 11 , which are cylindrical according to partial representation a, conical according to partial representation b and spherical according to partial representation c.
Das Eindrehen der Knochenschraube 1 in eine der Knochen platten 8 ist unter verschiedenen Winkelausrichtungen mög lich. Bei Neigung der Schraubenachse zur Lochachse findet im Bereich der Gewinde 6, 10 eine Materialumformung statt, die zu einer Reibschluß- bzw. Reibschweißverbindung zwischen Schraube 1 und Platte 8 führt. Zugleich legt sich die Platte 8 an den zu versorgenden Knochen an.The screwing of the bone screw 1 into one of the bone plates 8 is possible under different angular orientations. If the screw axis is inclined to the hole axis, a material deformation takes place in the area of the threads 6 , 10 , which leads to a frictional or friction weld connection between screw 1 and plate 8 . At the same time, the plate 8 lies against the bone to be treated.
Die Knochenschraube 1 gemäß Fig. 2 unterscheidet sich von der zuvor beschriebenen lediglich dadurch, daß der Schrau benkopf 3 angrenzend an die oberseitige Abflachung 5 einen seitlich überstehenden Anschlag 12 aufweist. Der Anschlag 12 soll verhindern, daß die Schraube 1 durch das Durch gangsloch einer Platte 8 tritt, indem sie sich mit dem An schlag an deren Oberseite anlegt.The bone screw 1 shown in FIG. 2 differs from that previously described only in that the screw head 3 adjacent to the top flattening 5 has a laterally projecting stop 12 . The stop 12 is intended to prevent the screw 1 from passing through the through hole of a plate 8 by applying the stop to the top thereof.
Die Knochenschraube 1 gemäß Fig. 3 unterscheidet sich von der gemäß Fig. 1 durch ein mehrgängiges Gewinde 6 an der sphärischen Sitzfläche 4. Wie bei den zuvor erläuterten Knochenschrauben 1 sind die Gewindegänge 6 durchgehend ausgebildet.The bone screw 1 according to FIG. 3 differs from that according to FIG. 1 by a multi-start thread 6 on the spherical seat surface 4 . As in the previously described bone screws 1 , the threads 6 are continuous.
Bei der Variante einer Knochenschraube 1 gemäß Fig. 4 weist hingegen der Schraubenkopf 3 an einer sphärischen Sitzfläche 4 ein zweigängiges Gewinde 6 auf, bei dem jeder Gewindegang aus voneinander beabstandeten Gewindesegmenten 13 besteht. Jedes Gewindesegment 13 ist linsenförmig aus geführt, d. h. hat ein zu seinem Einlaufende 14 und seinem Auslaufende 15 hin konvergierendes Profil. Bei dieser Schraube 1 haben die Gewindesegmente 13 einen konstanten Abstand, sind jedoch in den verschiedenen Gewindegängen an unterschiedlichen Umfangspositionen angeordnet.In the variant of a bone screw 1 according to FIG. 4, on the other hand, the screw head 3 has a two-start thread 6 on a spherical seat surface 4 , in which each thread turn consists of spaced-apart thread segments 13 . Each thread segment 13 is lenticular, ie has a profile converging towards its inlet end 14 and its outlet end 15 . In this screw 1 , the thread segments 13 have a constant distance, but are arranged in different thread positions at different circumferential positions.
Bei der Knochenschraube gemäß Fig. 5 trägt die sphärische Sitzfläche 4 des Schraubenkopfes 3 Gewindesegmente 13 ei nes Außengewindes 6, die in den verschiedenen Gewindegän gen in Gruppen 15 übereinander angeordnet sind. Zwischen den Gruppen 15 sind also meridionale gewindefreie Ab standsbereiche 16 ausgebildet. Bei dieser Schraube 1 han delt es sich um einen am Kopf 3 gehärteten Gewindeformer, der in ein gewindefreies Durchgangsloch einer Knochenplat te 8 eindrehbar ist. Dabei können die Abstandsbereiche 16 als Spannuten dienen. . 5 13 contributes to the bone screw according to FIG 4, the spherical seat surface of the screw head 3 thread segments ei nes external thread 6, which are gen in the various Gewindegän arranged in groups 15 one above the other. Meridional thread-free spacing areas 16 are thus formed between the groups 15 . This screw 1 is a hardened thread former on the head 3 , which can be screwed into a thread-free through hole of a bone plate 8 . The spacing areas 16 can serve as flutes.
Die Fig. 6 zeigt eine Knochenplatte 8, deren Durchgangs loch 9 ein durchgehendes Innengewinde 10 aufweist. Diese Platte 8 entspricht der Teildarstellung a der Fig. 1. Fig. 6 shows a bone plate 8 , the through hole 9 has a continuous internal thread 10 . This plate 8 corresponds to the partial representation a of FIG. 1.
Die Knochenplatte 8 der Fig. 7 hat im Durchgangsloch 9 ein Innengewinde 10 aus voneinander beabstandeten Gewindeseg menten 17. Jeder Gewindegang weist vier Gewindesegmente 17 auf, deren Profile jeweils zu den beiden Enden 18, 19 hin konvergieren.The bone plate 8 of FIG. 7 has an internal thread 10 from spaced threaded segments 17 in the through hole 9 . Each thread has four thread segments 17 , the profiles of which converge towards the two ends 18 , 19 .
Die Knochenplatte 8 der Fig. 8 unterscheidet sich von der vorherigen dadurch, daß nur drei Gewindesegmente 17 pro Gewindegang vorgesehen sind.The bone plate 8 of FIG. 8 differs from the previous one in that only three thread segments 17 are provided per thread.
Die Knochenplatte 8 gemäß Fig. 6 wird bevorzugt mit einer Knochenschraube 1 gemäß Fig. 4 kombiniert. Das durchgehen de Innengewinde 10 der Knochenplatte 8 kann unter ver schiedenen Schraubwinkeln in die Abstandsbereiche der Ge windesegmente 13 der Knochenschraube 1 eintreten.The bone plate 8 according to FIG. 6 is preferably combined with a bone screw 1 according to FIG. 4. The continuous de internal thread 10 of the bone plate 8 can occur at different screw angles in the spacing areas of the thread segments 13 of the bone screw 1 .
Die Knochenplatten 8 der Fig. 7 und 8 können beispiels weise mit Knochenschrauben 1 gemäß Fig. 3 oder 4 benutzt werden. Die Abstandsbereiche zwischen den Gewindesegmenten 17 lassen sowohl ein Eindringen des durchgehenden als auch des segmentierten Schraubengewindes 6 zu.The bone plates 8 of FIGS. 7 and 8 can be used, for example, with bone screws 1 according to FIG. 3 or 4. The spacing areas between the thread segments 17 allow both the continuous and the segmented screw thread 6 to penetrate.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE19934343117 DE4343117C2 (en) | 1993-12-17 | 1993-12-17 | Bone fixation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE19934343117 DE4343117C2 (en) | 1993-12-17 | 1993-12-17 | Bone fixation system |
Publications (2)
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DE4343117A1 true DE4343117A1 (en) | 1995-06-22 |
DE4343117C2 DE4343117C2 (en) | 1999-11-04 |
Family
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Family Applications (1)
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DE19934343117 Expired - Lifetime DE4343117C2 (en) | 1993-12-17 | 1993-12-17 | Bone fixation system |
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